Irwin 33 MKII

1976
Designer
Ted Irwin
Builder
Irwin Yachts
Associations
Irwin Yacht Owners
IOR 3/4 ton
# Built
?
Hull Type
Fin w/spade rudder
Construction
FG

Dimensions

Length Overall
33 0 / 10.1 m
Waterline Length
27 5 / 8.4 m
Beam
11 1 / 3.4 m
Draft
5 6 / 1.7 m
Displacement
11,950 lbs / 5,420 kg
Ballast
4,200 lbs / 1,905 kg
drawing

Rig and Sails

Type
Masthead Sloop
Reported Sail Area
489 ft2 / 45.4 m2
Total Sail Area
489.2 ft2 / 45.5 m2
Mainsail
Sail Area
195.3 ft2 / 18.1 m2
P
35 5 / 10.8 m
E
10 11 / 3.4 m
Mast Height
46 3 / 14.1 m
Foresail
Sail Area
294 ft2 / 27.3 m2
I
41 11 / 12.8 m
J
14 0 / 4.3 m
Forestay Length
44 3 / 13.5 m

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?

Calculations

Hull Speed
7.03 knots
Sail Area/Displacement
14.97
under powered
Ballast/Displacement
35.15
less stiff, less powerful
Displacement/Length
256.52
moderate
Comfort Ratio
25.28
coastal cruiser
Capsize Screening
1.95
better suited for ocean passages

Notes

Shoal draft: 3.92’
Keel/cb: BU: 4.0’ BD: 8.0’.
Some were raced at the IOR 3/4 ton level.


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